EP0448221A1 - Flame-retardant nylon resin composition - Google Patents
Flame-retardant nylon resin composition Download PDFInfo
- Publication number
- EP0448221A1 EP0448221A1 EP91301257A EP91301257A EP0448221A1 EP 0448221 A1 EP0448221 A1 EP 0448221A1 EP 91301257 A EP91301257 A EP 91301257A EP 91301257 A EP91301257 A EP 91301257A EP 0448221 A1 EP0448221 A1 EP 0448221A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- nylon
- flame
- retardant
- copolymer
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003063 flame retardant Substances 0.000 title claims abstract description 40
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 229920001778 nylon Polymers 0.000 title claims abstract description 15
- 239000011342 resin composition Substances 0.000 title claims description 26
- 239000004677 Nylon Substances 0.000 title claims description 12
- 239000000203 mixture Substances 0.000 claims abstract description 30
- 239000004793 Polystyrene Substances 0.000 claims abstract description 13
- 229920002223 polystyrene Polymers 0.000 claims abstract description 13
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 12
- PGGROMGHWHXWJL-UHFFFAOYSA-N 4-(azepane-1-carbonyl)benzamide Chemical compound C1=CC(C(=O)N)=CC=C1C(=O)N1CCCCCC1 PGGROMGHWHXWJL-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000004687 Nylon copolymer Substances 0.000 claims abstract description 10
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229920001955 polyphenylene ether Polymers 0.000 claims abstract description 8
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 8
- ALBYIUDWACNRRB-UHFFFAOYSA-N hexanamide Chemical compound CCCCCC(N)=O ALBYIUDWACNRRB-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910000410 antimony oxide Inorganic materials 0.000 claims abstract description 6
- 229910052736 halogen Inorganic materials 0.000 claims abstract description 6
- 150000002367 halogens Chemical class 0.000 claims abstract description 6
- VTRUBDSFZJNXHI-UHFFFAOYSA-N oxoantimony Chemical compound [Sb]=O VTRUBDSFZJNXHI-UHFFFAOYSA-N 0.000 claims abstract description 6
- DJZKNOVUNYPPEE-UHFFFAOYSA-N tetradecane-1,4,11,14-tetracarboxamide Chemical compound NC(=O)CCCC(C(N)=O)CCCCCCC(C(N)=O)CCCC(N)=O DJZKNOVUNYPPEE-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000011787 zinc oxide Substances 0.000 claims abstract description 6
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910001887 tin oxide Inorganic materials 0.000 claims abstract description 4
- NSBGJRFJIJFMGW-UHFFFAOYSA-N trisodium;stiborate Chemical compound [Na+].[Na+].[Na+].[O-][Sb]([O-])([O-])=O NSBGJRFJIJFMGW-UHFFFAOYSA-N 0.000 claims abstract description 4
- 238000002844 melting Methods 0.000 claims description 21
- 230000008018 melting Effects 0.000 claims description 21
- 229920000642 polymer Polymers 0.000 claims description 14
- 229920001577 copolymer Polymers 0.000 claims description 8
- 238000000465 moulding Methods 0.000 abstract description 4
- 229920006111 poly(hexamethylene terephthalamide) Polymers 0.000 abstract description 4
- 229920002302 Nylon 6,6 Polymers 0.000 abstract description 3
- 229920002292 Nylon 6 Polymers 0.000 abstract 1
- 229920000393 Nylon 6/6T Polymers 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 20
- 239000003365 glass fiber Substances 0.000 description 11
- 238000005476 soldering Methods 0.000 description 11
- 229920006139 poly(hexamethylene adipamide-co-hexamethylene terephthalamide) Polymers 0.000 description 10
- 229920006117 poly(hexamethylene terephthalamide)-co- polycaprolactam Polymers 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 150000003839 salts Chemical class 0.000 description 8
- 239000004952 Polyamide Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 229920002647 polyamide Polymers 0.000 description 7
- 238000006116 polymerization reaction Methods 0.000 description 7
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Chemical compound O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 description 6
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 239000011521 glass Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- NLJYVSRAICBDSH-UHFFFAOYSA-N 1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13,14,14,15,15-triacontachlorocyclopentadecane Chemical compound ClC1(Cl)C(Cl)(Cl)C(Cl)(Cl)C(Cl)(Cl)C(Cl)(Cl)C(Cl)(Cl)C(Cl)(Cl)C(Cl)(Cl)C(Cl)(Cl)C(Cl)(Cl)C(Cl)(Cl)C(Cl)(Cl)C(Cl)(Cl)C(Cl)(Cl)C1(Cl)Cl NLJYVSRAICBDSH-UHFFFAOYSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 4
- 230000002411 adverse Effects 0.000 description 4
- 238000007334 copolymerization reaction Methods 0.000 description 4
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- SLXKOJJOQWFEFD-UHFFFAOYSA-N 6-aminohexanoic acid Chemical compound NCCCCCC(O)=O SLXKOJJOQWFEFD-UHFFFAOYSA-N 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 229960002684 aminocaproic acid Drugs 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- -1 hexamethylene ammonium terephthalate Chemical compound 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000004417 polycarbonate Substances 0.000 description 3
- 229920000515 polycarbonate Polymers 0.000 description 3
- 238000005979 thermal decomposition reaction Methods 0.000 description 3
- VEORPZCZECFIRK-UHFFFAOYSA-N 3,3',5,5'-tetrabromobisphenol A Chemical compound C=1C(Br)=C(O)C(Br)=CC=1C(C)(C)C1=CC(Br)=C(O)C(Br)=C1 VEORPZCZECFIRK-UHFFFAOYSA-N 0.000 description 2
- 239000004604 Blowing Agent Substances 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000000975 dye Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- FQLAJSQGBDYBAL-UHFFFAOYSA-N 3-(azepane-1-carbonyl)benzamide Chemical compound NC(=O)C1=CC=CC(C(=O)N2CCCCCC2)=C1 FQLAJSQGBDYBAL-UHFFFAOYSA-N 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 235000011037 adipic acid Nutrition 0.000 description 1
- 239000001361 adipic acid Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000012757 flame retardant agent Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000001879 gelation Methods 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- GVYLCNUFSHDAAW-UHFFFAOYSA-N mirex Chemical compound ClC12C(Cl)(Cl)C3(Cl)C4(Cl)C1(Cl)C1(Cl)C2(Cl)C3(Cl)C4(Cl)C1(Cl)Cl GVYLCNUFSHDAAW-UHFFFAOYSA-N 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 229920006131 poly(hexamethylene isophthalamide-co-terephthalamide) Polymers 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
- 239000004034 viscosity adjusting agent Substances 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/18—Homopolymers or copolymers of aromatic monomers containing elements other than carbon and hydrogen
Definitions
- the present invention relates to a flame-retardant nylon polymer moulding composition, hereinafter referred to as a nylon resin composition which exhibits a good stability when it is in a molten state and is especially suitable for use in surface mounting technology. More particularly, it is concerned with a flame-retardant nylon resin composition which, owing to its good stability in a molten state resists heat encountered during the soldering operations of surface mounting and does not suffer decomposition and degradation during melt molding.
- a nylon improves in heat resistance as its melting point rises.
- a nylon with a high melting point needs a high processing temperature which causes decomposition and degradation during melt molding, giving rise to molded items having a poor appearance.
- it is difficult to achieve both a high heat resistance and ease of processing.
- compositions which contain a polyamide copolymer and a fire retardant .
- a polyamide copolymer having good heat resistance and moldability is obtained by copolymerizing hexamethylene terephthalamide and hexamethylene adipamide or by copolymerizing hexamethylene terephthalamide and caproamide (see JP-A-206827/1985, JP-A-159422/1986, and JP-A-283653/1986).
- Nylon resin compositions used in the electric and electronic industries are required to meet the UL-94 standard for a high degree of flame retardance (established by the Underwriters Laboratores in the U.S.).
- halogen-based flame-retardants have been proposed. It is known to incorporate, in a polyamide, a brominated polystyrene as a flame-retardant and additionally a metal oxide as an auxiliary flame-retardant (see JP-A-47044/1976 and JP-A-1403/1976). However, hexamethylene terephthalamide, for example, has too high a melting point for efficient blending into a brominated polystyrene.
- JP-A-116054/1979 discloses a composition composed of nylon and a brominated polyphenylene ether, and attempts to improve this composition by incorporation of further additives are disclosed in JP-A-223260/1987 and JP-A-138264/1989.
- JP-A-138264/1989 discloses a blend of 100 parts hexamethylene terephthalamide (nylon 6T)/hexamethylene isophthalamide (nylon 6I) copolymer, 10-100 parts brominated polystyrene, 0.5-100 parts NaSbO2 and 0.05-50 parts MgO or ZnO.
- the present invention provides a flame-retardant nylon resin composition which comprises, by weight of the total weight of the composition:
- the nylon copolymer (designated as component (A) above) is composed of 80-20 wt% of hexamethylene terephthalamide units and 20-80 wt% of hexamethylene adipamide and/or caproamide units.
- This nylon copolymer may be a polyamide copolymer (referred to hereinafter as 6T/66 copolyamide) which may be formed by the copolymerization of hexamethylene ammonium terephthalate with hexamethylene ammonium diadipate, or a polyamide copolymer (referred to hereinafter as 6T/6 copolyamide) which may be formed by the copolymerization of hexamethylene ammonium terephthalate with ⁇ -caprolactam or 6-aminocaproic acid or both.
- 6T/66 the ratio (by weight) of copolymerization i.e.
- 6T:66 should be from 80:20 to 20:80, preferably from 65:35 to 25:75, and more preferably from 59:41 to 30:70.
- the ratio (by weight) of copolymerization, i.e. 6T:6, should be from 80:20 to 20:80, preferably from 78:22 to 45:55, and more preferably from 78:22 to 60:40.
- the copolymer polyamide has a low melting point and hence is poor in heat resistance.
- the copolymer polyamide has a high melting point and hence has improved heat resistance, but needs a high processing temperature, which leads to the thermal decomposition of the polymer.
- the degree of polymerization of the 6T/66 and 6T/6 copolyamides is not particularly limited. Those having a relative viscosity of 1.5 to 5.0 (measured in 1% sulfuric acid solution at 25°C) are particularly useful.
- the resin composition of the present invention should contain 6T/66 copolyamide or 6T/6 copolyamide in an amount of 35-80 wt%, preferably 40-80 wt%, especially 50-80 wt% by weight of the total weight of the composition. With an amount less than 30 wt%, the resin composition is poor in mechanical strength (such as impact resistance). Conversely, with an amount in excess of 80 wt%, the resin composition is not so good in heat resistance, stiffness, creep resistance, dimensional stability, and warpage and deformation properties.
- the process for the production of the copolyamide resin used in a composition of the present invention may be produced easily by a conventional melt polymerization, which consists of preparing a prepolymer and subjecting the prepolymer to solid-phase polymerization or melt-mixing in an extruder to increase the degree of polymerization.
- the prepolymer is prepared by heating at 150-320°C an aqueous solution containing 6T salt (a salt formed from hexamethylenediamine and terephthalic acid) and 66 salt (a salt formed from hexamethylenediamine and adipic acid) or containing 6T salt and ⁇ -caprolactam or 6-aminocaproic acid or both.
- An alternative process consists of subjecting 6T salt and 66 salt (or 6-aminocaproic acid) directly to solid-phase polymerization at a temperature lower than the melting point.
- the copolyamide resin composition of the present invention may have incorporated in it a variety of additives such as a viscosity modifier, pigment, dye, antioxidant, and heat resistance improver, in such amounts that they do not have an unduly adverse effect upon its characteristic properties.
- additives such as a viscosity modifier, pigment, dye, antioxidant, and heat resistance improver, in such amounts that they do not have an unduly adverse effect upon its characteristic properties.
- the resin composition of the present invention contains a flame-retardant polymer designated as component (B).
- This flame-retardant is based on halogenated polystyrene and/or halogenated polyphenylene ether.
- the flame retardant polymer (B) contains 50-70 wt%, by weight of the flame retardant polymer, of halogen and has a weight-average molecular weight higher than 5000, preferably higher than 20,000 and more preferably higher than 28,000.
- the flame-retardant polymer With a weight-average molecular weight lower than 5000, the flame-retardant polymer has an adverse effect on the appearance of the molded item and increases the weight the resin composition loses on heating.
- An adequate amount of the flame-retardant in the composition is 5-35 wt%. With an amount less than 5 wt%, the flame-retardant does not produce the desired flame retardancy. Conversely, with an amount in excess of 35 wt%, the flame-retardant has an adverse effect on the mechanical properties such as impact strength.
- the halogen-containing flame-retardant is used in combination with an auxiliary flame-retardant designated as component (C).
- the auxiliary flame-retardant is a specific metal oxide which is selected from one or more of antimony oxide, sodium antimonate, tin oxide, iron oxide and zinc oxide. Most effective among these metal oxides is antimony oxide.
- An adequate amount of the auxiliary flame-retardant is 1-10 wt%, preferably 2-8 wt% by weight of the total composition.
- the resin composition of the present invention may contain a reinforcing agent designated as component (D).
- a reinforcing agent designated as component (D).
- This may be, for example, fibrous reinforcement such as glass fiber and carbon fiber, glass beads, talc, kaolin, wollastonite and mica.
- Preferable among them is glass fiber.
- Glass fiber materials suitable for use in compositions according to the present invention are those generally used as a reinforcing agent for thermoplastics resins and thermosetting resins. Preferred glass fiber materials take the form of glass rovings, chopped strand glass, and glass yarn made of continuous glass filaments 3-20 ⁇ m in diameter.
- the reinforcing agent should be added in an amount of 0-50 wt%, depending on the use of the molded item.
- the resin composition of the present invention may have, incorporated in it, one or more known additives such as a stabilizer, nucleating agent, blowing agent, auxiliary blowing agent, antistatic agent, pigment, and dye in amounts such that they do not have an unduly adverse effect upon its characteristic properties.
- additives such as a stabilizer, nucleating agent, blowing agent, auxiliary blowing agent, antistatic agent, pigment, and dye in amounts such that they do not have an unduly adverse effect upon its characteristic properties.
- nylon 6T/66 and 6T/6 copolymers are their melting profile as the proportional amounts of 6T and 66 or 6T and 6 vary. These are illustrated in the accompanying drawing. This shows that the melting profile of a 6T/6I copolymer as used in a composition of JP-A-138264/1989 is such that the melting point approaches the uppermost value only when a relatively high proportion of 6T is present. In contrast, a 6T/66 copolymer containing as much as 80% 66 has a relatively high melting point. This enables a composition containing the copolymer to be capable of producing a product having the excellent properties produced by the nylon 66 component and yet still have a sufficiently high melting point.
- the nylon 6T/66 copolymer has a melting point sufficiently high that the copolymer remains solid at soldering temperatures but sufficiently low to allow efficient blending with a halogenated polystyrene and/or halogenated polyphenylene ether and efficient processing. Furthermore, a nylon resin composition embodying the invention does not suffer degradation or decomposition at soldering temperatures above 250-260°C. This has enabled surface mounting technology to be revolutionised. Thus, instead of effecting soldering by subjecting localised regions to soldering heat (in order to avoid heating of the resin casing) it is now possible to effect soldering merely by feeding the entire surface mounted component through an oven set at the soldering temperature.
- these articles find particular use as items for electric and electronic parts, automotive parts, and building materials. They are especially useful in mounted electrical parts, particularly those found in motor cars.
- test was conducted as follows according to the UL standard.
- a test specimen vertically clamped at its upper end is burned by the application of a standard flame to its lower end for 10 seconds.
- the time required for the test specimen to burn until the fire goes out is measured (the "first flame” time).
- the test specimen is burned again by the application of a standard flame to its lower end for 10 seconds.
- the time required for the test specimen to burn until the fire goes out is measured (the "second flame” time ).
- the measurements are repeated for five test specimens.
- the total flame time of ten measurements is designated as T, and the maximum value in ten measurements is designated as M.
- test speciment is classed as V-0 if T is less than 50 seconds and M is less than 10 seconds, the flame does not reach the clamp and burning melt does not drip from the flame to an extent such that it can ignite cotton placed 12 inches below the test speciment.
- test specimen is classed as V-1 if T is less than 250 seconds and M is less than 30 seconds and the flame does not reach the clamp and burning melt does not drip from the flame to an extent such that it ignites cotton placed 12 inches below the test speciment.
- the resin composition was injection-molded into test specimens suitable for a burning test, and the specimens were examined for surface roughening, bubbles, and color. The appearance is rated as good, poor, and bad according to the following criteria.
- the surface staining of the test specimen is examined after ageing in a hot-air oven at 140°C for 3 days. Blooming is rated as good and bad according to the following criteria.
- a sample (8-10 mg) is heated at a rate of 20°C/min in a differential scanning calorimeter (Perkin-Elmer, Model 7) to give a melting curve.
- the maximum temperature on the melting curve is designated as T m.
- a copolyamide of 6T/66 (50/50 % by weight) was prepared as described below.
- the prepolymer was dried in vacuum at 100°C for 24 hours, then placed in a kneader (Model DS 3-7.5, manufactured by Moriyama Manufacturing Co.), and heated up to 250°C over a period of about 2 hours while blowing nitrogen (3 liter/min) into it.
- a resin composition was prepared from a copolyamide (in pellet form), glass fiber, flame-retardant, and auxiliary flame-retardant according to the formulation shown in Table 1.
- a resin composition was prepared in the same manner as in the above Examples from a copolyamide, glass fiber, flame retardant, and auxiliary flame-retardant according to the formulation shown in Table 2.
- the resin composition was made into test pieces, which were evaluated in the same manner as in the above Examples. The results are shown in Table 2.
Abstract
Description
- The present invention relates to a flame-retardant nylon polymer moulding composition, hereinafter referred to as a nylon resin composition which exhibits a good stability when it is in a molten state and is especially suitable for use in surface mounting technology. More particularly, it is concerned with a flame-retardant nylon resin composition which, owing to its good stability in a molten state resists heat encountered during the soldering operations of surface mounting and does not suffer decomposition and degradation during melt molding.
- A nylon improves in heat resistance as its melting point rises. On the other hand, a nylon with a high melting point needs a high processing temperature which causes decomposition and degradation during melt molding, giving rise to molded items having a poor appearance. Thus, it is difficult to achieve both a high heat resistance and ease of processing.
- In an attempt to overcome these difficulties various compositions have been proposed which contain a polyamide copolymer and a fire retardant . Thus, it is known that a polyamide copolymer having good heat resistance and moldability is obtained by copolymerizing hexamethylene terephthalamide and hexamethylene adipamide or by copolymerizing hexamethylene terephthalamide and caproamide (see JP-A-206827/1985, JP-A-159422/1986, and JP-A-283653/1986). Nylon resin compositions used in the electric and electronic industries are required to meet the UL-94 standard for a high degree of flame retardance (established by the Underwriters Laboratores in the U.S.). To this end, a variety of halogen-based flame-retardants have been proposed. It is known to incorporate, in a polyamide, a brominated polystyrene as a flame-retardant and additionally a metal oxide as an auxiliary flame-retardant (see JP-A-47044/1976 and JP-A-1403/1976). However, hexamethylene terephthalamide, for example, has too high a melting point for efficient blending into a brominated polystyrene. In addition, JP-A-116054/1979 discloses a composition composed of nylon and a brominated polyphenylene ether, and attempts to improve this composition by incorporation of further additives are disclosed in JP-A-223260/1987 and JP-A-138264/1989. In particular, JP-A-138264/1989 discloses a blend of 100 parts hexamethylene terephthalamide (
nylon 6T)/hexamethylene isophthalamide (nylon 6I) copolymer, 10-100 parts brominated polystyrene, 0.5-100 parts NaSbO₂ and 0.05-50 parts MgO or ZnO. However, since conventional soldering materials melt at around 250-260°C, it is necessary to effect soldering at temperatures above this, typically at 280-300°C. Anylon 6T/6I copolymer containing less than about 70% 6T has too low a melting point to withstand such high temperatures. Thus, where a surface mounted electrical component (as is usual) has a casing made from such a resin, it is necessary to effect soldering of the various components to the surface by a local heating technique which avoids subjecting the casing to soldering heat. - We have conducted research into the development of a flame-retardant composition which can be made into a molded item having high heat resistance and flame retardancy and also taking on a good appearance free of blooming.
- As a result of these investigations, it was found surprisingly that the above-mentioned problems can be solved if a specific nylon is combined with a specific flame-retardant, auxiliary flame-retardant, and reinforcing agent.
- Thus, the present invention provides a flame-retardant nylon resin composition which comprises, by weight of the total weight of the composition:
- (A) 30-90 wt% of a nylon copolymer comprising 80-20 wt% of hexamethylene terephthalamide units and 20-80 wt% of hexamethylene adipamide and/or caproamide units,
- (B) 5-35 wt% of a flame-retardant polymer comprising a halogenated polystyrene and/or a halogenated polyphenylene ether, which polymer contains 50-70 wt% by weight of the polymer of halogen and has a weight-average molecular weight of at least 5000,
- (C) 1-10 wt% of at least one auxiliary flame-retardant selected from antimony oxide, sodium antimonate, tin oxide, iron oxide, and zinc oxide, and
- (D) 0-50 wt% of a reinforcing agent, preferably an inorganic reinforcing agent.
- In a resin composition according to the present invention, the nylon copolymer (designated as component (A) above) is composed of 80-20 wt% of hexamethylene terephthalamide units and 20-80 wt% of hexamethylene adipamide and/or caproamide units. This nylon copolymer may be a polyamide copolymer (referred to hereinafter as 6T/66 copolyamide) which may be formed by the copolymerization of hexamethylene ammonium terephthalate with hexamethylene ammonium diadipate, or a polyamide copolymer (referred to hereinafter as 6T/6 copolyamide) which may be formed by the copolymerization of hexamethylene ammonium terephthalate with ε-caprolactam or 6-aminocaproic acid or both. In the case of 6T/66, the ratio (by weight) of copolymerization i.e. 6T:66, should be from 80:20 to 20:80, preferably from 65:35 to 25:75, and more preferably from 59:41 to 30:70. In the case of 6T/6, the ratio (by weight) of copolymerization, i.e. 6T:6, should be from 80:20 to 20:80, preferably from 78:22 to 45:55, and more preferably from 78:22 to 60:40. With the 6T component less than 20 wt%, the copolymer polyamide has a low melting point and hence is poor in heat resistance. Conversely, with the 6T component in excess of 80 wt%, the copolymer polyamide has a high melting point and hence has improved heat resistance, but needs a high processing temperature, which leads to the thermal decomposition of the polymer. The degree of polymerization of the 6T/66 and 6T/6 copolyamides is not particularly limited. Those having a relative viscosity of 1.5 to 5.0 (measured in 1% sulfuric acid solution at 25°C) are particularly useful.
- The resin composition of the present invention should contain 6T/66 copolyamide or 6T/6 copolyamide in an amount of 35-80 wt%, preferably 40-80 wt%, especially 50-80 wt% by weight of the total weight of the composition. With an amount less than 30 wt%, the resin composition is poor in mechanical strength (such as impact resistance). Conversely, with an amount in excess of 80 wt%, the resin composition is not so good in heat resistance, stiffness, creep resistance, dimensional stability, and warpage and deformation properties.
- There are no particular limitations on the process for the production of the copolyamide resin used in a composition of the present invention. It may be produced easily by a conventional melt polymerization, which consists of preparing a prepolymer and subjecting the prepolymer to solid-phase polymerization or melt-mixing in an extruder to increase the degree of polymerization. The prepolymer is prepared by heating at 150-320°C an aqueous solution containing 6T salt (a salt formed from hexamethylenediamine and terephthalic acid) and 66 salt (a salt formed from hexamethylenediamine and adipic acid) or containing 6T salt and ε-caprolactam or 6-aminocaproic acid or both. An alternative process consists of subjecting 6T salt and 66 salt (or 6-aminocaproic acid) directly to solid-phase polymerization at a temperature lower than the melting point.
- The copolyamide resin composition of the present invention may have incorporated in it a variety of additives such as a viscosity modifier, pigment, dye, antioxidant, and heat resistance improver, in such amounts that they do not have an unduly adverse effect upon its characteristic properties.
- The resin composition of the present invention contains a flame-retardant polymer designated as component (B). This flame-retardant is based on halogenated polystyrene and/or halogenated polyphenylene ether. A halogenated polystyrene, particularly a brominated polystyrene, is especially preferred. The flame retardant polymer (B) contains 50-70 wt%, by weight of the flame retardant polymer, of halogen and has a weight-average molecular weight higher than 5000, preferably higher than 20,000 and more preferably higher than 28,000. With a weight-average molecular weight lower than 5000, the flame-retardant polymer has an adverse effect on the appearance of the molded item and increases the weight the resin composition loses on heating. An adequate amount of the flame-retardant in the composition is 5-35 wt%. With an amount less than 5 wt%, the flame-retardant does not produce the desired flame retardancy. Conversely, with an amount in excess of 35 wt%, the flame-retardant has an adverse effect on the mechanical properties such as impact strength.
- In a composition according to the present invention, the halogen-containing flame-retardant is used in combination with an auxiliary flame-retardant designated as component (C). The auxiliary flame-retardant is a specific metal oxide which is selected from one or more of antimony oxide, sodium antimonate, tin oxide, iron oxide and zinc oxide. Most effective among these metal oxides is antimony oxide. An adequate amount of the auxiliary flame-retardant is 1-10 wt%, preferably 2-8 wt% by weight of the total composition.
- The resin composition of the present invention may contain a reinforcing agent designated as component (D). This may be, for example, fibrous reinforcement such as glass fiber and carbon fiber, glass beads, talc, kaolin, wollastonite and mica. Preferable among them is glass fiber. Glass fiber materials suitable for use in compositions according to the present invention are those generally used as a reinforcing agent for thermoplastics resins and thermosetting resins. Preferred glass fiber materials take the form of glass rovings, chopped strand glass, and glass yarn made of continuous glass filaments 3-20 µm in diameter. The reinforcing agent should be added in an amount of 0-50 wt%, depending on the use of the molded item.
- The resin composition of the present invention may have, incorporated in it, one or more known additives such as a stabilizer, nucleating agent, blowing agent, auxiliary blowing agent, antistatic agent, pigment, and dye in amounts such that they do not have an unduly adverse effect upon its characteristic properties.
- A particularly surprising aspect of
nylon 6T/66 and 6T/6 copolymers is their melting profile as the proportional amounts of 6T and 66 or 6T and 6 vary. These are illustrated in the accompanying drawing. This shows that the melting profile of a 6T/6I copolymer as used in a composition of JP-A-138264/1989 is such that the melting point approaches the uppermost value only when a relatively high proportion of 6T is present. In contrast, a 6T/66 copolymer containing as much as 80% 66 has a relatively high melting point. This enables a composition containing the copolymer to be capable of producing a product having the excellent properties produced by thenylon 66 component and yet still have a sufficiently high melting point. - Thus, the
nylon 6T/66 copolymer has a melting point sufficiently high that the copolymer remains solid at soldering temperatures but sufficiently low to allow efficient blending with a halogenated polystyrene and/or halogenated polyphenylene ether and efficient processing. Furthermore, a nylon resin composition embodying the invention does not suffer degradation or decomposition at soldering temperatures above 250-260°C. This has enabled surface mounting technology to be revolutionised. Thus, instead of effecting soldering by subjecting localised regions to soldering heat (in order to avoid heating of the resin casing) it is now possible to effect soldering merely by feeding the entire surface mounted component through an oven set at the soldering temperature. - Owing to the high degree of flame retardancy, good external appearance, and good heat resistance of moulded articles produced from compositions embodying the invention, these articles find particular use as items for electric and electronic parts, automotive parts, and building materials. They are especially useful in mounted electrical parts, particularly those found in motor cars.
- The invention will be described in more detail with reference to the following Examples and Comparative Examples. The resin compositions in the Examples and Comparative Examples were examined for characteristic properties according to the following test methods.
- The test was conducted as follows according to the UL standard. A test specimen vertically clamped at its upper end is burned by the application of a standard flame to its lower end for 10 seconds. The time required for the test specimen to burn until the fire goes out is measured (the "first flame" time). Immediately after that, the test specimen is burned again by the application of a standard flame to its lower end for 10 seconds. The time required for the test specimen to burn until the fire goes out is measured ( the "second flame" time ). The measurements are repeated for five test specimens. The total flame time of ten measurements is designated as T, and the maximum value in ten measurements is designated as M. The test speciment is classed as V-0 if T is less than 50 seconds and M is less than 10 seconds, the flame does not reach the clamp and burning melt does not drip from the flame to an extent such that it can ignite cotton placed 12 inches below the test speciment. Likewise, the test specimen is classed as V-1 if T is less than 250 seconds and M is less than 30 seconds and the flame does not reach the clamp and burning melt does not drip from the flame to an extent such that it ignites cotton placed 12 inches below the test speciment.
- The resin composition was injection-molded into test specimens suitable for a burning test, and the specimens were examined for surface roughening, bubbles, and color. The appearance is rated as good, poor, and bad according to the following criteria.
- good
- ... glossy, smooth surface
- poor
- ... less glossy, but smooth surface
- bad
- ... dull, rough surface
- The surface staining of the test specimen is examined after ageing in a hot-air oven at 140°C for 3 days. Blooming is rated as good and bad according to the following criteria.
- good
- ... surface not stained
- bad
- ... surface considerably stained
- A sample (8-10 mg) is heated at a rate of 20°C/min in a differential scanning calorimeter (Perkin-Elmer, Model 7) to give a melting curve. The maximum temperature on the melting curve is designated as Tm.
- A copolyamide of 6T/66 (50/50 % by weight) was prepared as described below.
- 5.877 kg of terephthalic acid, 6.377 kg of an aqueous 64.5 wt.%-solution of hexamethylenediamine, 10.000 kg of 66 salt and 6.307 kg of ion-exchanged water were introduced into a batch-type pressure polymerizer, which was then fully flushed by nitrogen. The monomers were then polymerized under heat and under a steam pressure of 17.5 kg/cm²-G. After the polymerization system had been heated up to 220°C over a period of 2 hours with stirring, the polymerization reaction was further continued for one hour at a temperature of 220-240°C. Then, stirring was stopped, and a prepolymer condensate was ejected out from the polymerizer into water owing to the pressure difference of 17.5 kg/cm²-G. The thus obtained prepolymer condensate had a viscosity of r=1.17 and a melting point of 224°C.
- The prepolymer was dried in vacuum at 100°C for 24 hours, then placed in a kneader (Model DS 3-7.5, manufactured by Moriyama Manufacturing Co.), and heated up to 250°C over a period of about 2 hours while blowing nitrogen (3 liter/min) into it. The prepolymer was aged for a further 3 hours at 250°C and then cooled to room temperature. As a result, a white powdery polymer having a viscosity ofr=2.70 and a melting point of 295°C was obtained.
- 58% by weight of the white powdery polymer, 30% by weight of glass fiber chopped strands each having a length of 3mm and a diameter of 13µm, 10% by weight of "Pyro-chek" 68PB and 2 parts by weight of antimony trioxide were dry-blended and thereafter melted and blended by the use of a 30 mm-vent type biaxial screw extruder at a cylinder temperature of 260-330°C. The resulting blend was shaped with an injection-moulding machine to form test pieces. The thus obtained test pieces were evaluated and the results are shown in Table 1 below.
- In each Example, a resin composition was prepared from a copolyamide (in pellet form), glass fiber, flame-retardant, and auxiliary flame-retardant according to the formulation shown in Table 1.
- . The copolyamide is any one of 6T/66 (50/50 wt%), 6T/6 (80/20 wt%), 6T/6 (70/30 wt%), and 6T/6 (60/40 wt%).
- . The glass fiber is in the form of chopped strand, 3 mm long and 13 µm in diameter.
- . The flame-retardant is any one of brominated polystyrene and brominated polyphenylene ether.
- . The auxiliary flame-retardant is antimony trioxide.
- All the components were mixed by melting at 260-335°C (cylinder temperature) using a 30-mm vented twin-screw extruder. The resulting mixture (in pellet form) was formed into test pieces by injection molding. The test pieces were examined for appearance, blooming, and flammability. The results are shown in Table 1.
- In each Comparative Example, a resin composition was prepared in the same manner as in the above Examples from a copolyamide, glass fiber, flame retardant, and auxiliary flame-retardant according to the formulation shown in Table 2.
- . The copolyamide is the same as that used in the above Examples.
- . The glass fiber is the same as that used in the above Examples.
- . The flame-retardant is any one of brominated polycarbonate, perchlorocyclopentadecane, tetrabromobisphenol-A (oligomer), and brominated epoxy.
- . The auxiliary flame-retardant is antimony trioxide.
- The resin composition was made into test pieces, which were evaluated in the same manner as in the above Examples. The results are shown in Table 2.
- The resin composition in which perchlorocyclopentadecane was incorporated did not give good pellets on account of considerable thermal decomposition in the case where the copolyamide was 6T/66 (50/50 wt%) or 6T/6 (80/20 wt%) which needs a higher temperature for melt-mixing (Comparative Examples 3 and 4).
- The resin composition based on 6T/6 (60/40 wt%) in which perchlorocyclopentadecane was incorporated did not meet the requirements for V-0 class (Comparative Example 10).
- The resin composition in which tetrabromobisphenol-A was incorporated did not meet the requirements for V-0 class (Comparative Examples 5 and 6).
- The resin composition in which brominated polycarbonate was incorporated did not give good test pieces on account of considerable thermal decomposition and blowing in the melt-mixing steps (Comparative Examples 1, 2 and 9).
- The resin composition in which brominated epoxy was incorporated did not give good pellets on account of excessive viscosity increase caused by gelation that took place in the melt-mixing step (Comparative Examples 7 and 8).
Note to Table 1
*1 Glass fiber chopped strand (3 mm, 13 µm in dia.)
*2 "Pyro-check" 68-PB (Nissan Ferro Co., Ltd.)
*3 "GLC" PO-64P (Great Lakes Chemicals Co., Ltd. and Miki Sangyo Co., Ltd.)
*4 DBE (Great Chemicals Co., Ltd.)
Note to Table 2
*1 Glass fiber chopped strand (3 mm, 13 µm in dia.)
*2 Brominated polycarbonate "FR-34" (Mitsubishi Gas Kagaku Co., Ltd.)
*3 Perchlorocyclopentadecane "Dechloran-plus" (Oxydental Chemical Co., Ltd.)
*4 Brominated epoxy "HR-128F" (Hitachi Kasei Co., Ltd.)
*5 "Platerm" FR500 (Dainippon Ink & Chemicals Co., Ltd.)
NM : not moldable
Claims (7)
- A flame-retardant nylon resin composition which comprises by weight of the total weight of the composition:(A) 30-90 wt% of a nylon copolymer comprising 80-20 wt% of hexamethylene terephthalamide units and 20-80 wt% of hexamethylene adipamide and/or caproamide units,(B) 5-35 wt% of a flame-retardant polymer comprising a halogenated polystyrene and/or halogenated polyphenylene ether which polymer contains 50-70 wt% by weight of the polymer of halogen and has a weight-average molecular weight of at least 5000,(C) 1-10 wt% of at least one auxiliary flame-retardant selected from antimony oxide, sodium antimonate, tin oxide, iron oxide, and zinc oxide, and(D) 0-50 wt% of a reinforcing agent.
- A composition according to claim 1, in which the nylon copolymer is a copolymer of (a) hexamethylene terephthalamide and (b) hexamethylene adipamide.
- A composition according to claim 1, in which the nylon copolymer is a copolymer of ( a ) hexamethylene terephthalamide and (c) caproamide.
- A composition according to claim 3, in which the nylon copolymer comprises from 80-60 wt% hexamethylene terephthalamide units and from 20-40 wt% of caproamide units.
- A composition according to any preceding claim, in which the flame retardant polymer (B) is a halogenated polystyrene.
- A composition according to any preceding claim, in which the auxiliary flame-retardant (C) is selected from at least one of antimony oxide and zinc oxide.
- A composition according to any preceding claim, in which the nylon copolymer is one prepared by first forming a prepolymer condensate having a relative viscosity of 1.20 or less and a melting point of 250°C or lower and then solid-polymerizing the prepolymer condensate at a temperature within the range of from 150°C to the melting point of the nylon polymer inclusive.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2037998A JPH03239755A (en) | 1990-02-19 | 1990-02-19 | Flame-retardant nylon resin composition |
JP37998/90 | 1990-02-19 |
Publications (2)
Publication Number | Publication Date |
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EP0448221A1 true EP0448221A1 (en) | 1991-09-25 |
EP0448221B1 EP0448221B1 (en) | 1996-01-24 |
Family
ID=12513247
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Application Number | Title | Priority Date | Filing Date |
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EP91301257A Expired - Lifetime EP0448221B1 (en) | 1990-02-19 | 1991-02-18 | Flame-retardant nylon resin composition |
Country Status (4)
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US (1) | US5258439A (en) |
EP (1) | EP0448221B1 (en) |
JP (1) | JPH03239755A (en) |
DE (1) | DE69116586T2 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0733082A1 (en) * | 1992-08-03 | 1996-09-25 | E.I. Du Pont De Nemours And Company | Flame resistance polyamide resin composition |
EP0737226A1 (en) * | 1993-12-28 | 1996-10-16 | E.I. Du Pont De Nemours And Company | A flame retardant polyamide resin composition |
WO1997031063A1 (en) * | 1996-02-26 | 1997-08-28 | Dsm N.V. | Flame retardant polyamide composition |
EP0960910A1 (en) * | 1998-05-29 | 1999-12-01 | Ube Industries, Ltd. | Flame-retardant aromatic polyamide resin compositions |
US6037401A (en) * | 1996-02-26 | 2000-03-14 | Dsm N.V. | Flame retardant polyamide composition |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995016737A1 (en) * | 1992-07-30 | 1995-06-22 | E.I. Du Pont De Nemours And Company | Flame resistant aromatic polyamide resin composition |
WO1994009070A1 (en) * | 1992-10-21 | 1994-04-28 | Teijin Limited | Resin composition and molded article |
TW521082B (en) | 2000-09-12 | 2003-02-21 | Kuraray Co | Polyamide resin composition |
WO2002024812A2 (en) | 2000-09-22 | 2002-03-28 | E.I. Dupont De Nemours And Company | Improved flame-retardant polyamide compositions |
JP5857742B2 (en) | 2009-09-14 | 2016-02-10 | 三菱瓦斯化学株式会社 | Flame retardant polyamide resin composition |
GB2497597A (en) * | 2011-12-12 | 2013-06-19 | Johnson Matthey Plc | A Catalysed Substrate Monolith with Two Wash-Coats |
WO2015021302A1 (en) * | 2013-08-08 | 2015-02-12 | Polyone Corporation | Flame retardant poly(hexamethylene adipamide) |
US9879136B2 (en) | 2013-08-08 | 2018-01-30 | Polyone Corporation | Flame retardant poly(hexano-6-lactam) |
CN108350235A (en) * | 2015-09-29 | 2018-07-31 | 奥升德高性能材料公司 | The co-polyamide composition of crystalline rate with reduction |
CN108034237A (en) * | 2017-11-23 | 2018-05-15 | 广东道生科技股份有限公司 | A kind of high-temperature and high-presure resistent fire-retardant nylon material and its preparation method and application |
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US4141880A (en) * | 1978-01-03 | 1979-02-27 | Velsicol Chemical Corporation | Flame retarded nylon composition |
EP0288269A1 (en) * | 1987-04-20 | 1988-10-26 | Mitsui Petrochemical Industries, Ltd. | Fire-retardant polyamide composition having a good heat resistance |
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US4760114A (en) * | 1981-02-26 | 1988-07-26 | General Electric Company | Polyphenylene ether compositions and process |
JPS61108659A (en) * | 1984-11-02 | 1986-05-27 | Sumitomo Chem Co Ltd | Resin composition |
JP2808106B2 (en) * | 1986-12-02 | 1998-10-08 | ジェイエスアール株式会社 | Nylon resin composition |
DE58908791D1 (en) * | 1988-07-13 | 1995-02-02 | Basf Ag | Flame-retardant thermoplastic molding compounds based on partially aromatic copolyamides. |
DE3924869A1 (en) * | 1989-07-27 | 1991-01-31 | Basf Ag | FLAME RETARDED THERMOPLASTIC MOLDS |
-
1990
- 1990-02-19 JP JP2037998A patent/JPH03239755A/en active Pending
-
1991
- 1991-02-08 US US07/652,835 patent/US5258439A/en not_active Expired - Lifetime
- 1991-02-18 DE DE69116586T patent/DE69116586T2/en not_active Expired - Fee Related
- 1991-02-18 EP EP91301257A patent/EP0448221B1/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US4141880A (en) * | 1978-01-03 | 1979-02-27 | Velsicol Chemical Corporation | Flame retarded nylon composition |
EP0288269A1 (en) * | 1987-04-20 | 1988-10-26 | Mitsui Petrochemical Industries, Ltd. | Fire-retardant polyamide composition having a good heat resistance |
Non-Patent Citations (2)
Title |
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DATABASE WPI, accession no. 76-42864x [23], Derwent Publications Ltd, London, GB; & JP-A-51 047 044 (TEIJIN K.K.) * |
PATENT ABSTRACTS OF JAPAN, vol. 12, no. 92 (C-483), 25th March 1988; & JP-A-62 223 260 (ASAHI CHEM. IND. CO., LTD) 01-10-1987 * |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0733082A1 (en) * | 1992-08-03 | 1996-09-25 | E.I. Du Pont De Nemours And Company | Flame resistance polyamide resin composition |
EP0733082A4 (en) * | 1992-08-03 | 1997-03-05 | Du Pont | Flame resistance polyamide resin composition |
EP0737226A1 (en) * | 1993-12-28 | 1996-10-16 | E.I. Du Pont De Nemours And Company | A flame retardant polyamide resin composition |
EP0737226A4 (en) * | 1993-12-28 | 1997-01-08 | Du Pont | A flame retardant polyamide resin composition |
WO1997031063A1 (en) * | 1996-02-26 | 1997-08-28 | Dsm N.V. | Flame retardant polyamide composition |
BE1010047A3 (en) * | 1996-02-26 | 1997-12-02 | Dsm Nv | Flame-retardant polyamide composition. |
US6037401A (en) * | 1996-02-26 | 2000-03-14 | Dsm N.V. | Flame retardant polyamide composition |
EP0960910A1 (en) * | 1998-05-29 | 1999-12-01 | Ube Industries, Ltd. | Flame-retardant aromatic polyamide resin compositions |
Also Published As
Publication number | Publication date |
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DE69116586T2 (en) | 1996-08-01 |
JPH03239755A (en) | 1991-10-25 |
US5258439A (en) | 1993-11-02 |
EP0448221B1 (en) | 1996-01-24 |
DE69116586D1 (en) | 1996-03-07 |
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